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Axial non-contrast

There is a wide necked posterolateral outpouching of the urinary bladder wall near the left VUJ, in keeping with a bladder diverticulum. This diverticulum is well defined and shows a large sized calculus (1400 - 1600HU) within it. The calculus exerts mass effect on the bilateral VUJ with resultant moderate upstream hydroureteronephrosis.